Nanosize particles of calcium phosphate were prepared by a new technique based on matrix mediated control of growth and morphology using polymer blends. The particle size could be reduced down to the order of 10 nm at a certain composition of the blend. These particles were stabilized and could be handled easily due to the polymer matrix surrounding them. Their crystal structure and size was confirmed by X-ray diffraction and electron microscopy. © 2000 Elsevier Science Ltd. All rights reserved.